the president campaigned in nevada and is scheduled to stay there the next few days as he gets ready for wednesday's debate. >> reporter: more than 11,000 people packed a high school in las vegas sunday night to listen to president obama. >> if you stand with me and work with me, we will win clark county again. we'll win nevada again. we'll win this election again. >> reporter: it was the president's last scheduled appearance before the first presidential debate on wednesday. like his opponent, he's trying to lower expectations. >> i know folks in the media are speculating already on who's going to have the best zingers. governor romney, he's a good debater. i'm just okay. >> reporter: mitt romney heads to colorado today for his last- minute cram session. romney fit in another rehearsal after church in boston on sunday. he's been practicing since june. while many believe wednesday's debate is a must win for romney, his running mate paul ryan says this will not be a defining moment. >> i don't think one event is going to make or break this campaign. >> reporter: but apparently not eve